Response Of Tomato To Different Water Treatments And Crop Model In Solar Greenhouse

Clarifying the response of water control treatment for tomato growth and development in greenhouse to water control treatment and determining the applicability of crop model are of great significance for agricultural scientific research and realizing the objectives of increasing production and improving quality of protected crops.In this paper,the greenhouse tomato experiment was carried out in Xinxiang experimental base of Chinese Academy of Agricultural Sciences.Based on the cumulative evaporation(E_P)of 20 cm standard evaporating dish and and combined with plastic film mulching,three treatments were set up:high water treatment without film(WM-0.9,water surface evaporation coefficient is 0.9),high water treatment with film(FM-0.9)and low water treatment with film(FM-0.5,water surface evaporation coefficient is 0.5),of which fm-0.9 treatment was the control treatment.Based on the experiment,the effects and variation rules of different water control conditions on tomato growth,development and yield were studied,and the root distribution characteristics of greenhouse tomato under water control were discussed.The root water uptake was simulated by HYDRUS-1D.On this basis,the influence mechanism of root water uptake on yield and water use efficiency was clarified.At the same time,the parameter corrected AquaCrop and DSSAT models were used to simulate the growth,development and yield formation process of tomato under different water control conditions.At the same time,the parameter corrected aquacrop and DSSAT models were used to simulate the growth and yield formation process of Tomato under different water control conditions.Through the comparative analysis of soil moisture,tomato canopy growth,aboveground biomass and yield,the adaptability of the models in Greenhouse Tomato in North China was evaluated.The results show:(1)Under the same irrigation system,film mulching treatment inhibited the root growth on the surface.The root length of WM-0.9 treatment under mulched at 0～20 cm was 106.0%higher than that of FM-0.9 under mulched.The total root length density,total root volume and total root surface area of WM-0.9 treatment were higher than those of treatment under mulched,but the film mulching treatment helped to improve the root water uptake,and the root water uptake of treatment under mulched increased by 24.4%.Under the same film mulching condition,the distribution of root is shallow,mainly concentrated at 0～20 cm.Under the action of water stress,FM-0.5 treatment reduces the root diameter as much as possible and increases the root surface area to obtain more soil water.The root water uptake of FM-0.5 treatment is 190.2 mm,which is 21.0%lower than FM-0.9.It can be seen that FM-0.9 treatment is more conducive to the increase of root water uptake.(2)The 0～40 cm soil layer is the main water uptake area of roots.The root water uptake of WM-0.9,FM-0.9 and FM-0.5 in this layer accounts for 84.2%,85.7%and 83.2%of the total root water uptake respectively.The root water uptake of WM-0.9 and FM-0.5 treatments decreased rapidly in the soil layer of 20～40 cm,while FM-0.9 treatment can still maintain a high root water uptake,which is conducive to the absorption and utilization of deep soil water.(3)The growth process of tomato in greenhouse was simulated by AquaCrop.The root mean square error between the simulated canopy coverage value and the measured value of each treatment is within 6.8%,and the root mean square error of soil moisture content is within 39.6 mm,and the relative error of aboveground biomass,yield and water use efficiency are within 2.0%,2.3%and 9.0%respectively.The error range of simulation prediction is low,so the consistency between the simulated and measured values is high.The model is feasible to apply to simulate tomato crops in greenhouse environment.However,under the condition of severe water stress,the simulation accuracy of the model is relatively low.(4)The simulation results of DSSAT show that,the root mean square error between the simulated value of leaf area index and the measured value is within 0.26 cm~2/cm~2,and the root mean square error between the simulated value of soil moisture content and the measured value is within 0.03 cm~3/cm~3,and the relative error between the simulated value of aboveground biomass and yield and the measured value are within 4.7%and 7.6%respectively,so the consistency between the simulated value and the measured value is high.At the same time,the simulation accuracy of WM-0.9 treatment under high water treatment without film is slightly higher than that of FM-0.9 treatment under high water and film mulching,indicating that DSSAT model has good stability for simulating crops in solar greenhouse without film.Under the condition of severe water stress,the simulation accuracy of DSSAT model is also relatively low.(5)According to the statistical indexes of the simulation results of canopy,soil moisture,aboveground biomass and yield,the simulation effect of AquaCrop model on tomato is slightly better than that of DSSAT model.